Plaster board or plaque.



No. 896,326. v PATENTED AUG. 18, 1908.

E. G. ROBERTS.

PLASTER. BOARD OR PLAQUE.

APPLICATION FILED NOV. 6, 1907.

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I I l l I l I l l l I 1 Svwentoz v (Ed/mu QM, witnesses I @Wm a/.G;,Mm 'ur uflfiduizwm. I mm UNITED STATES PATENT OFFICE.

EDWARD o. ROBERTS, OF SALTVILLE, VIRGINIA.

PLASTER IBQARD 0R PLAQUE.

Specification of LettersPatent.

Patented Aug. 18, loos.

Application filed November 6, 1907. Serial N 0. 400,931.,

To all whom it may concern:

Be it known that I, EDWARD C. ROBERTS, a citizen of the United States, resident of Saltville, in the county of Smyth and'State of .Virginia, have made a certain new and useful Invention in Cement Boards' or Plaques; and I declare the following'to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the invention, reference being bad to the accompanying drawings, and .to letters or figures of reference marked thereon, .which forin a part of this specification.

Figure 1 is a side view of theinvention partly broken away. Fig. 2 is a section on the line 2--2, Fig. 1, on a larger scale and partly broken away.

The invention relates to composite plaster boards or plaques, and it consists in'the novel similar depth or thickness.

construction and combinations of parts as hereinafter set forth.

Inthe accompanying drawings, illustratingthe invention, the letter a, designates a web or network of tough resilient wood the splints of Whiohare about 6/100 inch thick and one half-inch in .width and are woven to-'. gether to leave interspaces b, about one-half inch square. A mold or box of suitable size, usually about 32x36 inches with a depth of two inches, being provided, there is spread evenly ,upon the bottom thereof to a depth of about one-fourth inch a layer of mortar or cement 0, made of equal n'leasures of stucco (calcined gypsum) and wood fiber or wood pulp. The web or network aforesaid being laid upon the cement layer, a similar layer d,-

is spread evenly over the top thereof to a A top or rammer of about one'and one-half inches in thickness and fitting neatly in the box or mold is then forced down upon the top layer of mortar or cement under a suitable press until the top surface of such rammer is even or level with the top of the box or mold. The upper and lower layers of mortar or cement c, and (1,.

will then have been forced into the interspaces 1), of the web or network to entirely fill thesame, the completed board or plaque having a thickness about equal to the combined thicknesses of the two cement layers, or one half-inch. The wooden splints having a rough, porous surface the cement will closelyadhere thereto, and the wood fiber of .the cement entering between the splints in fiber constituent, located on both sides of said frame around the loose ends of the splints and forming a complete filling for said interspaces and a binding means for the loose ends of thesplints.

In testimony whereof I affix my signature, in presence of two witnesses.

EDWARD C. ROBERTS.

Witnesses:

H. B. SNYDER, LOCKIE WALKER. 

